@width: 100px;
@height: @width + 100px;

#header {
  width: @width;
  height: @height;
  background: #1b6d85;
}


.box {
  background-color: yellow;

}

.box .content {
    color: red;
}

.box p a {
    color: blue;
  }

.box p a:hover {
    text-decoration: none;
    color: #ff0000;
}

.box:hover .content {
    color: blue;
}